Sharpening machine for sharpening knives



FIG. 1 is a top plan view of the sharpening machine for sharpening knives showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a front perspective view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a side elevation view thereof taken from the right of FIG. 2; and,

FIG. 6 is a side elevation view thereof taken the left of FIG. 2.

The broken lines shown in the drawings represent unclaimed portions of the sharpener and form no part of the claimed design. 

The ornamental design for a sharpening machine for sharpening knives, as shown. 